View previous topic :: View next topic |
Author |
Message |
gogodr I post too much
Reputation: 125
Joined: 19 Dec 2006 Posts: 2041
|
Posted: Thu Aug 23, 2012 7:34 pm Post subject: Dont look :3 again |
|
|
Distribuciones Muestrales
Parametro: Es un numero o valor que representa una caracteristica de la poblacion. Para obtener su
valor, se debe usar toda la poblacion. Generalmente su valor es el objetivo de estudio. Los parametros
mas usados en estadistica son:
µ = (Σ Xi)/N Media o promedio
σ² = (Σ (Xi - µ)²)/N Variaza
π = (Σ Xi)/N proporcion
Estimacion o estadigrafo: es un numero o valor que representa y resume una caracteristica de la muestra
y que sirve como estimacion del valor del parametro.
Estimador o estadistica (ô) : Es una norma o regla que determina como usar los datos de la muestra. Es
funcion de las observaciones de la muestra.
** x¯ == promedio
S² { Σ (Xi - x¯)² / n-1 ; n ≤ 30
Σ (Xi - x¯)² / n ; n > 30
Teorema de distribucion de X¯
Si K muestras aleatorias de tamaño n son extraidas de una poblacion finita(N) o infinita con media µ y
varianza σ²
Las K medias X¯1, X¯2,... X¯k
a) E(x¯) = µ
b) V(x¯) = σ²x¯ { σ²/n ; Si la poblacion es infinita o el muestreo es con reposicion
σ²/n * (N-n/N-1) ; Si la poblacion es finita y el muestreo es sin reposicion
** La varianza de la muestra es la varianza de la poblacion entre el tamaño de la muestra.
Teorema de limite central
Sea x¯ = Σ Xi / n la media de una muestra aleatoria de tamaño n > 30 extraida de una poblacion finita o
infinita, entonces la variable x¯ se distribuye como una normal con media µ y varianza σ²/n
--
pagina 94 - Problema 9
El tiempo de fabricacion de una plancha de vidrio de 1m² es una variable aleatoria con distribucion
uniforme x~U[15,19]. Si se registran los tiempos de fabricacion de 200 planchas de vidrio. ¿Cual es la
probabilidad de que el tiempo promedio muestral sea menor que 16,85 min?
X~U[a,b]
µ = (a+b)/2
σ² = (b-a)²/12
x¯~N(17,0.081²)
P(x¯ < 16.85) = 0.032
--
Caso de distribucion de la media muestral
Poblacion normal y σ² conocida: X¯~ n(µ;σ²/n)
Poblacion no normal n > 30 : X¯ ~ n(µ,σ²/n)
poblacion normal y σ² desconocida(Se usa S²): t = (x¯-µ) / (S/√n) ~ t(n-1)
-This was done in paint, bored in class
|
|
Back to top |
|
 |
Kargarok Advanced Cheater
Reputation: 10
Joined: 28 Jul 2011 Posts: 60
|
Posted: Thu Aug 23, 2012 7:41 pm Post subject: |
|
|
You had the patience do do that
in paint
you are saint level
|
|
Back to top |
|
 |
elpacco Grandmaster Cheater Supreme
Reputation: 30
Joined: 16 Oct 2007 Posts: 1267
|
Posted: Thu Aug 23, 2012 7:43 pm Post subject: |
|
|
Why don't you just use pastebin?
_________________
[AM]Misery wrote: |
FangBanger wrote: | What is the best way for a lv19 Soldier to solo Sledge on Borderlands? | Shoot him. |
|
|
Back to top |
|
 |
br0l0ck Cheater
Reputation: 63
Joined: 15 Aug 2007 Posts: 38
|
Posted: Thu Aug 23, 2012 7:57 pm Post subject: |
|
|
i wish i was the mod of rs so i could delete your fucking stupid posts
|
|
Back to top |
|
 |
Maes Advanced Cheater
Reputation: 10
Joined: 09 Apr 2009 Posts: 50
|
Posted: Thu Aug 23, 2012 7:58 pm Post subject: |
|
|
>tells us not to look at his topic
>includes something for us specifically
It's almost like he's posting to show off his unimpressive work.
|
|
Back to top |
|
 |
gogodr I post too much
Reputation: 125
Joined: 19 Dec 2006 Posts: 2041
|
Posted: Thu Aug 23, 2012 8:06 pm Post subject: |
|
|
Brolock wrote: | i wish i was the mod of rs so i could delete your fucking stupid posts |
>delete stupid posts of RS
thats why are not mod
|
|
Back to top |
|
 |
br0l0ck Cheater
Reputation: 63
Joined: 15 Aug 2007 Posts: 38
|
Posted: Thu Aug 23, 2012 8:06 pm Post subject: |
|
|
gogodr wrote: | Brolock wrote: | i wish i was the mod of rs so i could delete your fucking stupid posts |
>delete stupid posts of RS
thats why are not mod | no not all the stupid posts in rs just yours.
|
|
Back to top |
|
 |
gogodr I post too much
Reputation: 125
Joined: 19 Dec 2006 Posts: 2041
|
Posted: Thu Aug 23, 2012 8:07 pm Post subject: |
|
|
Brolock wrote: | gogodr wrote: | Brolock wrote: | i wish i was the mod of rs so i could delete your fucking stupid posts |
>delete stupid posts of RS
thats why are not mod | no not all the stupid posts in rs just yours. | >I'm not all the stupid posts
|
|
Back to top |
|
 |
Sui Expert Cheater
Reputation: 7
Joined: 04 Sep 2008 Posts: 119
|
Posted: Thu Aug 23, 2012 8:10 pm Post subject: |
|
|
Los parametros gibe moni pliz i riport u hueuehuehue.
_________________
|
|
Back to top |
|
 |
|